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to familiarize by custom or use; habituate:
to accustom oneself to cold weather.
Historical Examples

He had to instruct them to row together, and to accustom the port oarsmen to pull starboard from time to time.
On the Spanish Main John Masefield

At its foot he stopped and tried to accustom his eyes to the darkness.
Keziah Coffin Joseph C. Lincoln

It is astonishing—the ease with which the human mind can accustom itself to the unfamiliar and hitherto strange.
Kent Knowles: Quahaug Joseph C. Lincoln

He looked up to accustom his eyes to the light and saw a dozen guns covering him.
The Coyote James Roberts

I saw her continue to conform and accustom herself to the new elements and elevating sensations which belong to the inner life.
The Best Psychic Stories Various

Get something to do yourself, and accustom your children to work.
A Hungarian Nabob Maurus Jkai

It is very startling news—I must have some time to accustom myself to it, and then I will be able to tell you what I can do.
The Days of My Life Mrs. Oliphant

But we accustom ourselves with a wonderful readiness to a happy fate.
The Call of the Blood Robert Smythe Hichens

It is intended for drill purposes to accustom the soldier to the operation of loading the rifle.
Manual for Noncommissioned Officers and Privates of Cavalry of the Army War Department.

To accustom the Indians to his mode of worship, he commenced chanting the litany of the Virgin.
The Adventures of the Chevalier De La Salle and His Companions, in Their Explorations of the Prairies, Forests, Lakes, and Rivers, of the New World, and Their Interviews with the Savage Tribes, Two Hundred Years Ago John S. C. Abbott

verb
(transitive) usually foll by to. to make (oneself) familiar (with) or used (to), as by practice, habit, or experience
v.

early 15c., from Old French acostumer (12c., Modern French accoutumer), from à “to” (see ad-) + costume (see costume (n.)). Related: Accustomed; accustoming.